arch/arm/kvm/coproc.h

   1 /*
   2  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3  * Authors: Christoffer Dall <c.dall@virtualopensystems.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #ifndef __ARM_KVM_COPROC_LOCAL_H__
  20 #define __ARM_KVM_COPROC_LOCAL_H__
  21
  22 struct coproc_params {
  23         unsigned long CRn;
  24         unsigned long CRm;
  25         unsigned long Op1;
  26         unsigned long Op2;
  27         unsigned long Rt1;
  28         unsigned long Rt2;
  29         bool is_64bit;
  30         bool is_write;
  31 };
  32
  33 struct coproc_reg {
  34         /* MRC/MCR/MRRC/MCRR instruction which accesses it. */
  35         unsigned long CRn;
  36         unsigned long CRm;
  37         unsigned long Op1;
  38         unsigned long Op2;
  39
  40         bool is_64bit;
  41
  42         /* Trapped access from guest, if non-NULL. */
  43         bool (*access)(struct kvm_vcpu *,
  44                        const struct coproc_params *,
  45                        const struct coproc_reg *);
  46
  47         /* Initialization for vcpu. */
  48         void (*reset)(struct kvm_vcpu *, const struct coproc_reg *);
  49
  50         /* Index into vcpu_cp15(vcpu, ...), or 0 if we don't need to save it. */
  51         unsigned long reg;
  52
  53         /* Value (usually reset value) */
  54         u64 val;
  55 };
  56
  57 static inline void print_cp_instr(const struct coproc_params *p)
  58 {
  59         /* Look, we even formatted it for you to paste into the table! */
  60         if (p->is_64bit) {
  61                 kvm_pr_unimpl(" { CRm64(%2lu), Op1(%2lu), is64, func_%s },\n",
  62                               p->CRn, p->Op1, p->is_write ? "write" : "read");
  63         } else {
  64                 kvm_pr_unimpl(" { CRn(%2lu), CRm(%2lu), Op1(%2lu), Op2(%2lu), is32,"
  65                               " func_%s },\n",
  66                               p->CRn, p->CRm, p->Op1, p->Op2,
  67                               p->is_write ? "write" : "read");
  68         }
  69 }
  70
  71 static inline bool ignore_write(struct kvm_vcpu *vcpu,
  72                                 const struct coproc_params *p)
  73 {
  74         return true;
  75 }
  76
  77 static inline bool read_zero(struct kvm_vcpu *vcpu,
  78                              const struct coproc_params *p)
  79 {
  80         *vcpu_reg(vcpu, p->Rt1) = 0;
  81         return true;
  82 }
  83
  84 /* Reset functions */
  85 static inline void reset_unknown(struct kvm_vcpu *vcpu,
  86                                  const struct coproc_reg *r)
  87 {
  88         BUG_ON(!r->reg);
  89         BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
  90         vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
  91 }
  92
  93 static inline void reset_val(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
  94 {
  95         BUG_ON(!r->reg);
  96         BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
  97         vcpu_cp15(vcpu, r->reg) = r->val;
  98 }
  99
 100 static inline void reset_unknown64(struct kvm_vcpu *vcpu,
 101                                    const struct coproc_reg *r)
 102 {
 103         BUG_ON(!r->reg);
 104         BUG_ON(r->reg + 1 >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
 105
 106         vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
 107         vcpu_cp15(vcpu, r->reg+1) = 0xd0c0ffee;
 108 }
 109
 110 static inline int cmp_reg(const struct coproc_reg *i1,
 111                           const struct coproc_reg *i2)
 112 {
 113         BUG_ON(i1 == i2);
 114         if (!i1)
 115                 return 1;
 116         else if (!i2)
 117                 return -1;
 118         if (i1->CRn != i2->CRn)
 119                 return i1->CRn - i2->CRn;
 120         if (i1->CRm != i2->CRm)
 121                 return i1->CRm - i2->CRm;
 122         if (i1->Op1 != i2->Op1)
 123                 return i1->Op1 - i2->Op1;
 124         if (i1->Op2 != i2->Op2)
 125                 return i1->Op2 - i2->Op2;
 126         return i2->is_64bit - i1->is_64bit;
 127 }
 128
 129
 130 #define CRn(_x)         .CRn = _x
 131 #define CRm(_x)         .CRm = _x
 132 #define CRm64(_x)       .CRn = _x, .CRm = 0
 133 #define Op1(_x)         .Op1 = _x
 134 #define Op2(_x)         .Op2 = _x
 135 #define is64            .is_64bit = true
 136 #define is32            .is_64bit = false
 137
 138 bool access_vm_reg(struct kvm_vcpu *vcpu,
 139                    const struct coproc_params *p,
 140                    const struct coproc_reg *r);
 141
 142 #endif /* __ARM_KVM_COPROC_LOCAL_H__ */